format(value) — Python Technical Interview Questions & Answers

format(value)

format(value)

  • format is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.
  • format(value) — output: 090. Width 3, pad with zeros.
  • Fresher trap: writing s.format() and expecting s to update. Strings are immutable. Write s = s.format(...) if you need the new value (when it returns a string).

Technical Interview Tip: Call format on one real word and say what prints.

Code Examples for format(value)

Example

# format(value)
print(format(90, "03d"))

format(value) — output: 090. Width 3, pad with zeros.

How to Explain format(value) to an Interviewer

Explain format(value) as if you are teaching a junior — definition, then one tiny script.

format works on str. format usually returns a new string.

What does the example print, and why?

format(value) — output: 090

What mistake do freshers make with format(value)?

format does not change the original string in place.